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Employee Benefits And Retirement Plans - Schedule of Computed Benefit Obligations and Net Assets and Related Changes (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]      
Benefit obligation at beginning of year $ 13,308,069us-gaap_DefinedBenefitPlanBenefitObligation $ 12,929,816us-gaap_DefinedBenefitPlanBenefitObligation $ 12,360,897us-gaap_DefinedBenefitPlanBenefitObligation
Service cost 0us-gaap_DefinedBenefitPlanServiceCost 0us-gaap_DefinedBenefitPlanServiceCost 0us-gaap_DefinedBenefitPlanServiceCost
Interest cost 727,305us-gaap_DefinedBenefitPlanInterestCost 697,704us-gaap_DefinedBenefitPlanInterestCost 709,226us-gaap_DefinedBenefitPlanInterestCost
Amendments 0us-gaap_DefinedBenefitPlanPlanAmendments 0us-gaap_DefinedBenefitPlanPlanAmendments 0us-gaap_DefinedBenefitPlanPlanAmendments
Benefits paid (1,020,747)us-gaap_DefinedBenefitPlanBenefitsPaid (974,761)us-gaap_DefinedBenefitPlanBenefitsPaid (934,397)us-gaap_DefinedBenefitPlanBenefitsPaid
Other - net 308,124us-gaap_DefinedBenefitPlanOtherChanges 655,310us-gaap_DefinedBenefitPlanOtherChanges 794,090us-gaap_DefinedBenefitPlanOtherChanges
Benefit obligation at end of year 13,322,751us-gaap_DefinedBenefitPlanBenefitObligation 13,308,069us-gaap_DefinedBenefitPlanBenefitObligation 12,929,816us-gaap_DefinedBenefitPlanBenefitObligation
Fair value of plan assets at beginning of year 11,819,296us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 11,249,592us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 10,262,781us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Actual return on plan assets 485,129us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets 769,465us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets 547,865us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets
Employer contribution 606,000us-gaap_DefinedBenefitPlanContributionsByEmployer 775,000us-gaap_DefinedBenefitPlanContributionsByEmployer 1,373,343us-gaap_DefinedBenefitPlanContributionsByEmployer
Benefits paid. (1,020,747)us-gaap_DefinedBenefitPlanBenefitsPaid (974,761)us-gaap_DefinedBenefitPlanBenefitsPaid (934,397)us-gaap_DefinedBenefitPlanBenefitsPaid
Fair value of plan assets at end of year 11,889,678us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 11,819,296us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 11,249,592us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Funded status (1,433,073)us-gaap_DefinedBenefitPlanFundedStatusOfPlan (1,488,773)us-gaap_DefinedBenefitPlanFundedStatusOfPlan (1,680,224)us-gaap_DefinedBenefitPlanFundedStatusOfPlan
Unrecognized net actuarial (gain)/loss 0SGB_DefinedBenefitPlanUnrecognizedNetActuarialGainloss 0SGB_DefinedBenefitPlanUnrecognizedNetActuarialGainloss 0SGB_DefinedBenefitPlanUnrecognizedNetActuarialGainloss
Unrecognized prior service cost 0SGB_DefinedBenefitPlanUnrecognizedPriorServiceCost 0SGB_DefinedBenefitPlanUnrecognizedPriorServiceCost 0SGB_DefinedBenefitPlanUnrecognizedPriorServiceCost
Pension liability included in other liabilities (1,433,073)SGB_DefinedBenefitPlanPensionLiabilityIncludedInOtherLiabilities (1,488,773)SGB_DefinedBenefitPlanPensionLiabilityIncludedInOtherLiabilities (1,680,224)SGB_DefinedBenefitPlanPensionLiabilityIncludedInOtherLiabilities
Accumulated benefit obligation $ 13,322,751us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation $ 13,308,069us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation $ 12,929,816us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation